<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../vue.js"></script>
</head>

<body>
  <div id="app">
    <input type="text" v-model="search"/>
    <ul>
      <li v-for="item in newPerson" :key="item.id">{{item.name}}--{{item.ages}}</li>
    </ul>
  </div>
  <script>
    Vue.config.productionTip = false;

    const vm = new Vue({
      el: "#app",
      data() {
        return {
          search: "",
          person: [{
              id: "001",
              name: "lao",
              age: "18"
            },
            {
              id: "002",
              name: "xiaowang",
              age: "16"
            },
            {
              id: "003",
              name: "dawang",
              age: "14"
            }
          ],
          newPerson: []
        }
      },
      watch: {
        search: {
          immediate: true,
          handler(newValue) {
            this.newPerson = this.person.filter(item => {
              return item.name.includes(newValue)
            })
          }
        }
      }
    })
  </script>
</body>

</html>